Traverse mechanism for rayon spinning machines



APrll 1953 H. c. BOLTON ET AL 2,633,693

TRAVERSE MECHANISM FOR RAYON SPINNING MACHINES I Filed Nov. 8, 1951 2 SHEETS-SHEET 1 /n venfars Henry C/emenf 50/10/7 Les/n9 Rose By their affameys April 1953 H. c. BOLTON ET AL 2,633,693

TRAVERSE MECHANISM FOR RAYON SPINNING MACHINES Filed Nov. 8, 1951 2 SHEETSSHEET 2 F IG. 3.

F IG. 5.

//7 ven/ors Henry C/emen/ 50/f0/7 Les/A9 /-?056 By Meir attorneys Patented Apr. 7, 1953 TRAVERSE MECHANISM FOR RAYON SPINNING MACHINES Henry Clement Bolton, Kidderminster, and Leslie Rose, Whitefield, near Manchester, England, assignors to Courtaulds Limited, London, England, a British company Application November 8, 1951, Serial No. 255,388

In Great Britain October 31, 1947 1 I This invention relates to a traverse mechanism for rayon spinning machines in whichthe thread guide feeding the extruded filaments to a rotating spinning box is traversed through the action of a follower on a cam. This application is a continuation in part application of our application Serial No. 54,626 filed October 15th, 1948, now abandoned.

In accordance with conventional practice the curve of the cam is a so-called true cardiac curve (in fact a portion of a spiral of Archimedes combined with its mirror image), rounded at the tip and root for some 3. The true cardiac curve gives a steady traverse for the thread guide and the rounding over an angle of some 3 is not sufiicient to interrupt in any material way the.

steady traversing action so that a cake with substantially cylindrical and parallel surfaces is obtained. In practice it is usual to make the height of the spinning box slightly greater than the stroke of the thread guide, for example, with a stroke of 4.49 inches the height of the box is normally 4.6 inches. In this specification the term -height of the box means the distance from the bottom of the box to the under surface of the lid of the box and is substantially equal to the height of the cake collected in the box. With existing apparatus it has now been found that there is a maximum permissible speed at about 32 beats perminute and above this speed there is excessive vibration of the thread guides which results in faulty cakes. One cause is the fact that the acceleration given to the cam-follower at speeds above 32 beats per minute exceeds the acceleration due to gravity (g) at the tip and at the root of the cam. In standard pot spinning machines, two banks of funnels are reciprocated by two cams arranged at the ends of the banks; each cam has a follower, and the two followers are arranged on a traverse bar 22 (in Fig. 3 of this application). In practice one cam will wear more than the other, so that one cam follower will not in practice completely follow the contour of its cam, but will bev influenced by the other follower to leave the surface of the cam and crashes back on to it after a short aerial path. The shock is transmitted to the traverse rail which thus vibrates with its own natural frequency. 4 Y H e j It is the object of the present invention to provide traverse mechanism for a rayon spinning machine which will permit of higher speeds than heretofore.

According to the present invention a rayon centrifugal spinning machine comprising a spin- 2 Glaims. (o1. 57-46) out excessive vibration in the machine. For extive to the stroke of the thread guide may conveniently be made by raising the bottom of the funnel (the normal thread guide employed) from ing the thread guide axially of the spinning box is provided with the combination of a cam activating said cam follower, said cam being rounded ofi at the tip and the root over angles of at least 10 (preferably 15) whereby thestroke of the guide has an appreciable dwell at each end and filaments are accumulated at the top and bottom of the box, and means for adjusting the height of the box with respect to the stroke of the cam so that the stroke of the guide is substantially shorter than the height of the spinning box in such degree that automatic spreading out of the accumulated filaments occurs and a cake having inside and outside surfaces substantially cylindrical and parallel is obtained. The cam is preferably aheart-shaped cam, but a cylindrical or shell cam may also be used.

The effect of rounding oil the tip and the root of the cam over at least 10 without simultaneous adjustment of the height of the spinning box relative to the stroke of the thread guide would be to produce a cake substantially thicker at the top and the base than at the centre with sub sequent difficulties in washing and treating which would be shown in the quality, for example dyeing affinity, of the yarn taken from the various parts of the cake. It has been found, however,

that by sufficiently increasing the height of the box relative to the stroke of the thread guide.

a cake having inside and outside surfaces which are substantially cylindrical and parallel can be obtained and hence a combination of this feature with the rounding 01f of the tip and root of the cam over at least 10 permits a substantial 'increase in the number of beats per minute withample, in an existing machine having a maximum permissible speed of about 32 beats per minute, the substitution of a cam rounded at the tip and the root over angles of 15 coupled with suitable adjustment of the height of the box relative to the stroke of the thread guide permitted speeds of the order of 48 beats per minute with satisfactory performance of the machine.

The adjustment of the height of the box relathe floor of the box to the required extent for example by holding the f unnel in a ring held by a screwed bush which can be screwed upwardly j or downwardly so that the bottom of the funnel 55. I ning box, a thread guide for feeding filam cuts to the spmnin g boxahd a cam follower fortraversis correspondingly moved upwardly or downwardly, and providing the box with a lid having a recess of substantially increased depth. Thus with a s'eriesof lids each'with a different depth below the recess, provision may beinade so that and a lid difierent types of cakes can be collected with a single box. The difference between the height of the box and the stroke of the thread guide is preferably varied according to the denier of the thread being spun, the higher the denier the greater the difference. This difference may be ascertained. by simple tests by varying the position of the bottom of the funnel and using lids of difierent thicknesses; the differenceshouldbe arranged equally at the top and the bottom of the stroke.

The invention is illustrated byway of example in the accompanying diagrammatic drawings in which Figure 1 is a plan viewzof one form of, cam suitable for use in the present invention,

Figure 2 is a vertical section of a funnel, a. centrifugal spinning box and cover, the box height X compared with the dimension Y showing the adjustment of the height of the; box according to the invention,

Figure 3 is a diagrammatic view on a reduced scale of a double-sided spinning machine in accordance with; the invention comprising a rounded cam, a cam follower; a traverse bar and two funnels, and

Figures 4 and 5' show lids having recesses of different depths to give the necessary adjustment of the height of the box- X.

Figure 1 shows a cam I- which apart fromthe tip 2 and the root- 3- is a true cardiac curve. The tip 2 and the root 3- are both rounded off over an angle a subtended at the centre 9 and is shown as about Chain lines 4 and 5 Show the normal tipand root respectivelyof" a true cardiac curve.

Referring to Figures 2 and 3, a reciprocatin funnel 6 is usedv to lay a thread T into a spinning centrifugal box 8 to form a cake- 9; The funnel 6 has a stem part Hiand a cone-shaped part II which rests on a metal ring [2;- in the top of a bush i3; Bush'ltscrews: intoa support l4 which is reciprocated by means ofabar 15 which; in accordance with standard practice, is secured toafollower I? which runs in the grooveof the cam it Thefollower IT slides vertically on guides 18-. Adjustment'of theposition of the funnel at the-bottom of the-stroke-is obtained by screwing the bush l3 upwardly or downwardly as the case'may be box 8 is provided with a circumferential lip l9 IS witha recess 26 of appreciable depthand a central hole 2i forpassage of" the funnel 3. In accordance with the presentinvention the height of the box (X) i-s-made longer than the length (Y) of the traverse stroke of the funnel 6 so that thethreadl whenformed into the cake 9, automatically spreads out to form a cake having substantially cylindricaland parallel inside-and outside surfaces; Other lids it having recesses 2-D and 20 of difierent thicknesses are illustratedinFigures- 4"andf 5? The inventionisillustrated by the following examples in which a camhaving its-tipand-root: rounded off over an-angle of about: 15as-sli0wn in Figure 1 was used with a spinnin'g-box-= assembly as shownin FiguresZ andB; Percentagesam by weight. a

' Example 1 A viscose having a. cellulose. content. of 715 per. cent and av caustic,sodacontents-ofv 65 per cent and aged tota; saltfigure of 5.12 was extruded througha 3' et designed to ,iorm -a,.60 .denier. threadrinto a -coagulanti bath at. 45 centigrade. containing f9,5.,perscent of, sulphuricv-acid;

The spinning I 20 per cent of sodium sulphate and 1 per cent of zinc sulphate. From the bath the thread was passed over a godet and was then collected in a centrifugal box at a speed of metres per minute, corresponding to about 45 beats per minute. The height of the box, corresponding to X in the drawing, was 4.90 inches and the length of the traverse stroke, corresponding to Y wasv 4.49 inches. In order that cake should be uniform, the stroke of the funnel ended at a distance of .205 inch from the top and bottom of the box. A cake of substantially uniform thickness was obtained.

Example 2 Example 1 was repeated but in this case a jet designed to produce 75 denier thread was used, the height of the box was adjusted to 4.96 inches and the length of the traverse stroke was 4.49 inches. A; cake of substantially uniform thickness was obtained.

Example 3 Example 1 was repeated but in this case a jet designed to produce denier thread was used, the height of the box was adjusted to 5.62 inches and the length of the traverse stroke was 4.49 inches. A cake of substantially uniform thickness was obtained.

What we claim is:

1. In a rayon centrifugal spinning machine comprising a spinning box, a thread guide for feeding filaments tothe spinning box and a cam follower for traversing the thread guide axially of the spinning box, the combination of a cam activating said cam follower; said camhaving the shape of atrue cardiac curve; except forthe tip, and the root; said cam being rounded-oii at thetip and; root over angles of about 10 to about 15, whereby the stroke of the guide has an appreciable dwell at each end and filaments are accumulated at the top and bottom of the box, and means for adjusting the height of the box with respect to the stroke of the cam so that the stroke of the guide is substantially shorterthan the height" of the spinning box in such degree that automatic spreading out of the accumulated filaments occurs and a cake having inside" and outside surfaces substantially cylindrical and parallel is obtained.

21 In a rayon centrifugal spinning machine according to-claim 1, the provision asthe/means for adjusting. the height of thebox with respect to the stroke of the thread guide, of a-vertically adjustable support for the guide and aremovu able cover for thebox each adapted to provide cylindricaland' parallel cake surfaces; are obtained HEN-RY CLEMENT BOLTONI LESLIE ROSE.

REFERENCES CITED The: following references are-off record in". the

V UNITED STATES PATENTS Number 

